Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7864e130ac63252…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cde321ba4c3ea79ede5e7744ea0f8dbe SHA-1: d7d0135a71ef81bee08413bcd73c737397bc892a SHA-256: a7864e130ac632521f2b37165b6aead0b42325265137735e7545029abf300c91
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. This structure strongly suggests a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF format and the nature of the URLs indicate potential for embedded JavaScript or other exploits to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.1617

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=responsabilidade+social+empresarial+teoria+e+pr%C3%A1tica+ten%C3%B3rio+pdf PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mt592hrvgo1s79chtb6begro6r/55837833343.pdfIn PDF document text
    • https://proxus.nl/file/xajuruvomedexupikurov.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fdac1473---76458155258.pdfIn PDF document text
    • http://newo.ru/files/files/megogurafopivaweli.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cde87bd38---tikajokadal.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fuforukeragalozi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc5ba8fd---44313595437.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41d1a0e8---72966491670.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38496245817.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d67419b7451c66e45e6111767aefc1cc/71578423529.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zajodir.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/25736684344.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vilowek.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210815_014601.pdfIn PDF document text
    • http://praguetransfer.com/files/file/letomokakojo.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/fenasudidar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ba9cef2---tofutasewovowenuzewul.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab14fc8e21a64fb1281b02d56d93121/kelemez.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/10177673650.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/21479239439.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/13681912361.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/43958852145.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/436e86174d4e68387a0f3ed3c5e8f10d/xuwalax.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lukipolovebovaxirajobul.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/63364196093.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/9986890182.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 20768 bytes
SHA-256: 5681c6d125d318f8e473b005614ecc256da55d21797a938058b1aa95123374f3